From 976700da4fe63861847f150b788ff0bc3d3cc41c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=AD=B1=E5=82=91?= <840465812@qq.com>
Date: Sat, 15 Jun 2019 09:42:51 +0800
Subject: [PATCH] Add DataTable <=> Model Convert Helper

---
 DataHelper/ModelHandler.cs | 153 +++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 DataHelper/ModelHandler.cs

diff --git a/DataHelper/ModelHandler.cs b/DataHelper/ModelHandler.cs
new file mode 100644
index 0000000..a99ba0f
--- /dev/null
+++ b/DataHelper/ModelHandler.cs
@@ -0,0 +1,153 @@
+    /// <summary>
+    /// DataTable与实体类互相转换
+    /// </summary>
+    /// <typeparam name="T">实体类</typeparam>
+    public class ModelHandler<T> where T : new()
+    {
+        #region DataTable转换成实体类
+
+        /// <summary>
+        /// 填充对象列表：用DataSet的第一个表填充实体类
+        /// </summary>
+        /// <param name="ds">DataSet</param>
+        /// <returns></returns>
+        public List<T> FillModel(DataSet ds)
+        {
+            if (ds == null || ds.Tables[0] == null || ds.Tables[0].Rows.Count == 0)
+            {
+                return null;
+            }
+            else
+            {
+                return FillModel(ds.Tables[0]);
+            }
+        }
+
+        /// <summary>  
+        /// 填充对象列表：用DataSet的第index个表填充实体类
+        /// </summary>  
+        public List<T> FillModel(DataSet ds, int index)
+        {
+            if (ds == null || ds.Tables.Count <= index || ds.Tables[index].Rows.Count == 0)
+            {
+                return null;
+            }
+            else
+            {
+                return FillModel(ds.Tables[index]);
+            }
+        }
+
+        /// <summary>  
+        /// 填充对象列表：用DataTable填充实体类
+        /// </summary>  
+        public List<T> FillModel(DataTable dt)
+        {
+            if (dt == null || dt.Rows.Count == 0)
+            {
+                return null;
+            }
+            List<T> modelList = new List<T>();
+            foreach (DataRow dr in dt.Rows)
+            {
+                //T model = (T)Activator.CreateInstance(typeof(T));  
+                T model = new T();
+                for (int i = 0; i < dr.Table.Columns.Count; i++)
+                {
+                    PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
+                    if (propertyInfo != null && dr[i] != DBNull.Value)
+                        propertyInfo.SetValue(model, dr[i], null);
+                }
+                
+                modelList.Add(model);
+            }
+            return modelList;
+        }
+
+        /// <summary>  
+        /// 填充对象：用DataRow填充实体类
+        /// </summary>  
+        public T FillModel(DataRow dr)
+        {
+            if (dr == null)
+            {
+                return default(T);
+            }
+
+            //T model = (T)Activator.CreateInstance(typeof(T));  
+            T model = new T();
+
+            for (int i = 0; i < dr.Table.Columns.Count; i++)
+            {
+                PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
+                if (propertyInfo != null && dr[i] != DBNull.Value)
+                    propertyInfo.SetValue(model,dr[i],null);
+            }
+            return model;
+        }
+
+        #endregion
+
+        #region 实体类转换成DataTable
+
+        /// <summary>
+        /// 实体类转换成DataSet
+        /// </summary>
+        /// <param name="modelList">实体类列表</param>
+        /// <returns></returns>
+        public DataSet FillDataSet(List<T> modelList)
+        {
+            if (modelList == null || modelList.Count == 0)
+            {
+                return null;
+            }
+            else
+            {
+                DataSet ds = new DataSet();
+                ds.Tables.Add(FillDataTable(modelList));
+                return ds;
+            }
+        }
+
+        /// <summary>
+        /// 实体类转换成DataTable
+        /// </summary>
+        /// <param name="modelList">实体类列表</param>
+        /// <returns></returns>
+        public DataTable FillDataTable(List<T> modelList)
+        {
+            if (modelList == null || modelList.Count == 0)
+            {
+                return null;
+            }
+            DataTable dt = CreateData(modelList[0]);
+
+            foreach(T model in modelList)
+            {
+                DataRow dataRow = dt.NewRow();
+                foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
+                {
+                    dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null);
+                }
+                dt.Rows.Add(dataRow);
+            }
+            return dt;
+        }
+
+        /// <summary>
+        /// 根据实体类得到表结构
+        /// </summary>
+        /// <param name="model">实体类</param>
+        /// <returns></returns>
+        private DataTable CreateData(T model)
+        {
+            DataTable dataTable = new DataTable(typeof (T).Name);
+            foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
+            {
+                dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType));
+            }
+            return dataTable;
+        }
+
+        #endregion
+    }
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